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Finding the Fourth Proportional to 278,716.01, 418,101.70 and 89,128.74

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Solution

The fourth proportional to 278,716.01, 418,101.70 and 89,128.74 is: 133,701.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,716.01 : 418,101.70 = 89,128.74 : x
  2. Step 2: Convert to fraction form
    278,716.01/418,101.70 = 89,128.74/x
  3. Step 3: Cross multiply
    278,716.01x = 418,101.70 × 89,128.74
  4. Step 4: Simplify right side
    278,716.01x = 37,264,877,712.86
  5. Step 5: Solve for x
    x = 37,264,877,712.86/278,716.01
  6. Step 6: Final answer
    x = 133,701.96

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.